(38) 



The following description is made from the adult specimen, seven 

 inches long. Head, with flap, 2B in length ; depth 2 1-6. Eye=snout, 4^1 in 

 head. The eye is large but smaller than the opercular spot, and not quite 

 equal to inter-orbital space. D. I, 12: A. Ill, 10 ; dorsal spines rather short 

 and stout, as long as from snout to middle of orbit. Second anal spine 

 stout, third as long as dorsal spines. Pectorals and ventrals long, about 

 reaching anal, the ventrals being the longer. Ventral spine longer than dorsal 

 spines. Body elongated, much elevated in front, heavy. General form and 

 proportions of 7. obscurus, {^ff-} Jord. Mouth wide for Ichthelis ; maxilla- 

 ries reaching to line from middle of orbit; fins high, spines rather low but 

 very stout. Occipital region very prominent and narrow in adult. The 

 caudal peduncle about as long as wide in front. Color in alcohol, dusky, 

 mottled with orange and blue ; cheeks with wide blue bands obscurely de- 

 fined ; dusky dorsal and anal spot. Belly and lower fins with orange and 

 yellow shades, in life apparently coppery yellow; each scale on sides and 

 back with a blackish, longitudinal oblong spot resembling the markings of I. 

 inscriptus. Lower jaw and lower parts of cheeks a dull leaden blue, prob- 

 ably brilliant in life ; blue line in front of and yellowish band around eye ; 

 opercular spot large, flap very broad and black, with a very broad pale 

 edge entirely surrounding the black ; the posterior width of edge more 

 than half that of pupil ; scales very large and crowded. Lat. 1. 46 ; longitu- 

 dinal rows 5-14; the lateral line very high; opercular scales large, 

 those on cheeks moderate and six-rowed. Top of head flat and short, form- 

 ing an angle with abruptly descending profile : rim of orbit slightly elevated. 

 Coloration resembling that of /. obscurus and Pomotis auritus. Its nearest 

 relative is the former, from which it difi"ers in the presence of blue lines on 

 the cheeks, wider snout and widely margined opercular flap. The smaller 

 specimen bears considerable resemblance to P. aurittis, being less gibbous 

 and having the opercular flap smaller ; it may be distinguished at once, how- 

 ever, by the large mouth and pointed pharyngeals. 



35. 1. macrochira, Raf. Gilded Sun Fish. A few specimens have 

 been examined from tributaries of the Illinois and the Wabash valley. 



36. I. anagallinus, (^C'ope.) Bliss. Red-spotted Sun Fish. One speci- 

 men in the collection from the Fox river. 



/. inscriptus ^xohdthly occurs in the southern part of the state, but I have 

 seen no specimen. 



37. 1. megalotis, Raf. Long-eared Sun Fish. Rather common in the 

 southern part of the state. 



38. 1. sanguinolentis, {Aff.') Bliss. Blue and Orange Sun Fish. Very 

 abundant through the state, especially in northern part. 



Genus Pomotis, Raf. 



39. P. auritus (i.) Gunth. Common Sun Fish. Very abundant in the 

 northern part of the state. Prof. Jordan informs me that it does not occur 

 in the Wabash valley. 



FAMILY APHREDODERIDAE. 



In the present article I have the pleasure of adding a second genus to 



